真值图是表达逻辑代数运算的一种直观图形。用真值图进行病虫多因子综合定性预报,效果较好,使用普遍。利用真值图作多因子多级预报,目前尚未见资料报道。笔者用方城县农业局病虫测报站15年小地老虎一代幼虫测报资料进行二因子真值图三级预报探讨,效果很好。现介绍此法如下: 方城县病虫测报站15年资料证明,小地 The truth map is an intuitive graph that expresses logical algebra. Using truth map for multi-factorial comprehensive prediction of pests and diseases, the effect is better and the use is universal. The use of truth map as a multi-factor multi-level forecast, no data reported. The author uses Fangcheng County Bureau of Agriculture Pest Report Station 15 years of small tiger generation larvae measured data for two-factor truth map three forecast, the effect is very good. Now introduce this method is as follows: Fangcheng Pest Report Station 15 years of evidence, a small land